// Copyright (c) 2012 Andrei Rinea
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;

namespace BenchmarkNet
{
    public class BenchmarkResult
    {
        public TimeSpan TotalTime { get; private set; }
        public TimeSpan TimePerIteration { get; private set; }
        public uint IterationsMade { get; private set; }
        public bool ErrorsEncountered { get; private set; }

        public BenchmarkResult(TimeSpan totalTime, uint iterationsMade, bool completed)
        {
            TotalTime = totalTime;
            IterationsMade = iterationsMade;
            ErrorsEncountered = !completed;
            TimePerIteration = iterationsMade > 0 ? new TimeSpan(totalTime.Ticks / iterationsMade) : TimeSpan.MaxValue;
        }

        public override string ToString()
        {
            return "Time per iteration : " + TimePerIteration + ", Total iterations succeded : " + IterationsMade;
        }

        public static BenchmarkResult Aggregate(IEnumerable<BenchmarkResult> results)
        {
            if (results == null) throw new ArgumentNullException("results");

            var totalTime = results.Max(r => r.TotalTime);
            var iterationsMade = (uint)0;
            var completed = true;
            foreach (var result in results)
            {
                iterationsMade += result.IterationsMade;
                if (result.ErrorsEncountered) completed = false;
            }
            return new BenchmarkResult(totalTime, iterationsMade, completed);
        }
    }
}